drivers/mmc/core/sdio.c

   1 /*
   2  *  linux/drivers/mmc/sdio.c
   3  *
   4  *  Copyright 2006-2007 Pierre Ossman
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/module.h>
  14 #include <linux/pm_runtime.h>
  15
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/mmc.h>
  19 #include <linux/mmc/sdio.h>
  20 #include <linux/mmc/sdio_func.h>
  21 #include <linux/mmc/sdio_ids.h>
  22
  23 #include "core.h"
  24 #include "bus.h"
  25 #include "sd.h"
  26 #include "sdio_bus.h"
  27 #include "mmc_ops.h"
  28 #include "sd_ops.h"
  29 #include "sdio_ops.h"
  30 #include "sdio_cis.h"
  31
  32 #ifdef CONFIG_MMC_EMBEDDED_SDIO
  33 #include <linux/mmc/sdio_ids.h>
  34 #endif
  35
  36 static int sdio_read_fbr(struct sdio_func *func)
  37 {
  38         int ret;
  39         unsigned char data;
  40
  41         if (mmc_card_nonstd_func_interface(func->card)) {
  42                 func->class = SDIO_CLASS_NONE;
  43                 return 0;
  44         }
  45
  46         ret = mmc_io_rw_direct(func->card, 0, 0,
  47                 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
  48         if (ret)
  49                 goto out;
  50
  51         data &= 0x0f;
  52
  53         if (data == 0x0f) {
  54                 ret = mmc_io_rw_direct(func->card, 0, 0,
  55                         SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
  56                 if (ret)
  57                         goto out;
  58         }
  59
  60         func->class = data;
  61
  62 out:
  63         return ret;
  64 }
  65
  66 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
  67 {
  68         int ret;
  69         struct sdio_func *func;
  70
  71         BUG_ON(fn > SDIO_MAX_FUNCS);
  72
  73         func = sdio_alloc_func(card);
  74         if (IS_ERR(func))
  75                 return PTR_ERR(func);
  76
  77         func->num = fn;
  78
  79         if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
  80                 ret = sdio_read_fbr(func);
  81                 if (ret)
  82                         goto fail;
  83
  84                 ret = sdio_read_func_cis(func);
  85                 if (ret)
  86                         goto fail;
  87         } else {
  88                 func->vendor = func->card->cis.vendor;
  89                 func->device = func->card->cis.device;
  90                 func->max_blksize = func->card->cis.blksize;
  91         }
  92
  93         card->sdio_func[fn - 1] = func;
  94
  95         return 0;
  96
  97 fail:
  98         /*
  99          * It is okay to remove the function here even though we hold
 100          * the host lock as we haven't registered the device yet.
 101          */
 102         sdio_remove_func(func);
 103         return ret;
 104 }
 105
 106 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
 107 {
 108         int ret;
 109         int cccr_vsn;
 110         int uhs = ocr & R4_18V_PRESENT;
 111         unsigned char data;
 112         unsigned char speed;
 113
 114         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
 115
 116         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
 117         if (ret)
 118                 goto out;
 119
 120         cccr_vsn = data & 0x0f;
 121
 122         if (cccr_vsn > SDIO_CCCR_REV_3_00) {
 123                 pr_err("%s: unrecognised CCCR structure version %d\n",
 124                         mmc_hostname(card->host), cccr_vsn);
 125                 return -EINVAL;
 126         }
 127
 128         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
 129
 130         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
 131         if (ret)
 132                 goto out;
 133
 134         if (data & SDIO_CCCR_CAP_SMB)
 135                 card->cccr.multi_block = 1;
 136         if (data & SDIO_CCCR_CAP_LSC)
 137                 card->cccr.low_speed = 1;
 138         if (data & SDIO_CCCR_CAP_4BLS)
 139                 card->cccr.wide_bus = 1;
 140
 141         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
 142                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
 143                 if (ret)
 144                         goto out;
 145
 146                 if (data & SDIO_POWER_SMPC)
 147                         card->cccr.high_power = 1;
 148         }
 149
 150         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
 151                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 152                 if (ret)
 153                         goto out;
 154
 155                 card->scr.sda_spec3 = 0;
 156                 card->sw_caps.sd3_bus_mode = 0;
 157                 card->sw_caps.sd3_drv_type = 0;
 158                 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
 159                         card->scr.sda_spec3 = 1;
 160                         ret = mmc_io_rw_direct(card, 0, 0,
 161                                 SDIO_CCCR_UHS, 0, &data);
 162                         if (ret)
 163                                 goto out;
 164
 165                         if (mmc_host_uhs(card->host)) {
 166                                 if (data & SDIO_UHS_DDR50)
 167                                         card->sw_caps.sd3_bus_mode
 168                                                 |= SD_MODE_UHS_DDR50;
 169
 170                                 if (data & SDIO_UHS_SDR50)
 171                                         card->sw_caps.sd3_bus_mode
 172                                                 |= SD_MODE_UHS_SDR50;
 173
 174                                 if (data & SDIO_UHS_SDR104)
 175                                         card->sw_caps.sd3_bus_mode
 176                                                 |= SD_MODE_UHS_SDR104;
 177                         }
 178
 179                         ret = mmc_io_rw_direct(card, 0, 0,
 180                                 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
 181                         if (ret)
 182                                 goto out;
 183
 184                         if (data & SDIO_DRIVE_SDTA)
 185                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
 186                         if (data & SDIO_DRIVE_SDTC)
 187                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 188                         if (data & SDIO_DRIVE_SDTD)
 189                                 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
 190                 }
 191
 192                 /* if no uhs mode ensure we check for high speed */
 193                 if (!card->sw_caps.sd3_bus_mode) {
 194                         if (speed & SDIO_SPEED_SHS) {
 195                                 card->cccr.high_speed = 1;
 196                                 card->sw_caps.hs_max_dtr = 50000000;
 197                         } else {
 198                                 card->cccr.high_speed = 0;
 199                                 card->sw_caps.hs_max_dtr = 25000000;
 200                         }
 201                 }
 202         }
 203
 204 out:
 205         return ret;
 206 }
 207
 208 static int sdio_enable_wide(struct mmc_card *card)
 209 {
 210         int ret;
 211         u8 ctrl;
 212
 213         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 214                 return 0;
 215
 216         if (card->cccr.low_speed && !card->cccr.wide_bus)
 217                 return 0;
 218
 219         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 220         if (ret)
 221                 return ret;
 222
 223         if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
 224                 pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
 225                            mmc_hostname(card->host), ctrl);
 226
 227         /* set as 4-bit bus width */
 228         ctrl &= ~SDIO_BUS_WIDTH_MASK;
 229         ctrl |= SDIO_BUS_WIDTH_4BIT;
 230
 231         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 232         if (ret)
 233                 return ret;
 234
 235         return 1;
 236 }
 237
 238 /*
 239  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 240  * of the card. This may be required on certain setups of boards,
 241  * controllers and embedded sdio device which do not need the card's
 242  * pull-up. As a result, card detection is disabled and power is saved.
 243  */
 244 static int sdio_disable_cd(struct mmc_card *card)
 245 {
 246         int ret;
 247         u8 ctrl;
 248
 249         if (!mmc_card_disable_cd(card))
 250                 return 0;
 251
 252         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 253         if (ret)
 254                 return ret;
 255
 256         ctrl |= SDIO_BUS_CD_DISABLE;
 257
 258         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 259 }
 260
 261 /*
 262  * Devices that remain active during a system suspend are
 263  * put back into 1-bit mode.
 264  */
 265 static int sdio_disable_wide(struct mmc_card *card)
 266 {
 267         int ret;
 268         u8 ctrl;
 269
 270         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 271                 return 0;
 272
 273         if (card->cccr.low_speed && !card->cccr.wide_bus)
 274                 return 0;
 275
 276         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 277         if (ret)
 278                 return ret;
 279
 280         if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
 281                 return 0;
 282
 283         ctrl &= ~SDIO_BUS_WIDTH_4BIT;
 284         ctrl |= SDIO_BUS_ASYNC_INT;
 285
 286         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 287         if (ret)
 288                 return ret;
 289
 290         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
 291
 292         return 0;
 293 }
 294
 295
 296 static int sdio_enable_4bit_bus(struct mmc_card *card)
 297 {
 298         int err;
 299
 300         if (card->type == MMC_TYPE_SDIO)
 301                 return sdio_enable_wide(card);
 302
 303         if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
 304                 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 305                 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 306                 if (err)
 307                         return err;
 308         } else
 309                 return 0;
 310
 311         err = sdio_enable_wide(card);
 312         if (err <= 0)
 313                 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
 314
 315         return err;
 316 }
 317
 318
 319 /*
 320  * Test if the card supports high-speed mode and, if so, switch to it.
 321  */
 322 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
 323 {
 324         int ret;
 325         u8 speed;
 326
 327         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 328                 return 0;
 329
 330         if (!card->cccr.high_speed)
 331                 return 0;
 332
 333         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 334         if (ret)
 335                 return ret;
 336
 337         if (enable)
 338                 speed |= SDIO_SPEED_EHS;
 339         else
 340                 speed &= ~SDIO_SPEED_EHS;
 341
 342         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 343         if (ret)
 344                 return ret;
 345
 346         return 1;
 347 }
 348
 349 /*
 350  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 351  */
 352 static int sdio_enable_hs(struct mmc_card *card)
 353 {
 354         int ret;
 355
 356         ret = mmc_sdio_switch_hs(card, true);
 357         if (ret <= 0 || card->type == MMC_TYPE_SDIO)
 358                 return ret;
 359
 360         ret = mmc_sd_switch_hs(card);
 361         if (ret <= 0)
 362                 mmc_sdio_switch_hs(card, false);
 363
 364         return ret;
 365 }
 366
 367 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
 368 {
 369         unsigned max_dtr;
 370
 371         if (mmc_card_highspeed(card)) {
 372                 /*
 373                  * The SDIO specification doesn't mention how
 374                  * the CIS transfer speed register relates to
 375                  * high-speed, but it seems that 50 MHz is
 376                  * mandatory.
 377                  */
 378                 max_dtr = 50000000;
 379         } else {
 380                 max_dtr = card->cis.max_dtr;
 381         }
 382
 383         if (card->type == MMC_TYPE_SD_COMBO)
 384                 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
 385
 386         return max_dtr;
 387 }
 388
 389 static unsigned char host_drive_to_sdio_drive(int host_strength)
 390 {
 391         switch (host_strength) {
 392         case MMC_SET_DRIVER_TYPE_A:
 393                 return SDIO_DTSx_SET_TYPE_A;
 394         case MMC_SET_DRIVER_TYPE_B:
 395                 return SDIO_DTSx_SET_TYPE_B;
 396         case MMC_SET_DRIVER_TYPE_C:
 397                 return SDIO_DTSx_SET_TYPE_C;
 398         case MMC_SET_DRIVER_TYPE_D:
 399                 return SDIO_DTSx_SET_TYPE_D;
 400         default:
 401                 return SDIO_DTSx_SET_TYPE_B;
 402         }
 403 }
 404
 405 static void sdio_select_driver_type(struct mmc_card *card)
 406 {
 407         int host_drv_type = SD_DRIVER_TYPE_B;
 408         int card_drv_type = SD_DRIVER_TYPE_B;
 409         int drive_strength;
 410         unsigned char card_strength;
 411         int err;
 412
 413         /*
 414          * If the host doesn't support any of the Driver Types A,C or D,
 415          * or there is no board specific handler then default Driver
 416          * Type B is used.
 417          */
 418         if (!(card->host->caps &
 419                 (MMC_CAP_DRIVER_TYPE_A |
 420                  MMC_CAP_DRIVER_TYPE_C |
 421                  MMC_CAP_DRIVER_TYPE_D)))
 422                 return;
 423
 424         if (!card->host->ops->select_drive_strength)
 425                 return;
 426
 427         if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
 428                 host_drv_type |= SD_DRIVER_TYPE_A;
 429
 430         if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
 431                 host_drv_type |= SD_DRIVER_TYPE_C;
 432
 433         if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
 434                 host_drv_type |= SD_DRIVER_TYPE_D;
 435
 436         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
 437                 card_drv_type |= SD_DRIVER_TYPE_A;
 438
 439         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
 440                 card_drv_type |= SD_DRIVER_TYPE_C;
 441
 442         if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
 443                 card_drv_type |= SD_DRIVER_TYPE_D;
 444
 445         /*
 446          * The drive strength that the hardware can support
 447          * depends on the board design.  Pass the appropriate
 448          * information and let the hardware specific code
 449          * return what is possible given the options
 450          */
 451         drive_strength = card->host->ops->select_drive_strength(
 452                 card->sw_caps.uhs_max_dtr,
 453                 host_drv_type, card_drv_type);
 454
 455         /* if error just use default for drive strength B */
 456         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
 457                 &card_strength);
 458         if (err)
 459                 return;
 460
 461         card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
 462         card_strength |= host_drive_to_sdio_drive(drive_strength);
 463
 464         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
 465                 card_strength, NULL);
 466
 467         /* if error default to drive strength B */
 468         if (!err)
 469                 mmc_set_driver_type(card->host, drive_strength);
 470 }
 471
 472
 473 static int sdio_set_bus_speed_mode(struct mmc_card *card)
 474 {
 475         unsigned int bus_speed, timing;
 476         int err;
 477         unsigned char speed;
 478
 479         /*
 480          * If the host doesn't support any of the UHS-I modes, fallback on
 481          * default speed.
 482          */
 483         if (!mmc_host_uhs(card->host))
 484                 return 0;
 485
 486         bus_speed = SDIO_SPEED_SDR12;
 487         timing = MMC_TIMING_UHS_SDR12;
 488         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 489             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 490                         bus_speed = SDIO_SPEED_SDR104;
 491                         timing = MMC_TIMING_UHS_SDR104;
 492                         card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 493                         card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 494         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 495                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 496                         bus_speed = SDIO_SPEED_DDR50;
 497                         timing = MMC_TIMING_UHS_DDR50;
 498                         card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 499                         card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 500         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 501                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 502                     SD_MODE_UHS_SDR50)) {
 503                         bus_speed = SDIO_SPEED_SDR50;
 504                         timing = MMC_TIMING_UHS_SDR50;
 505                         card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 506                         card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 507         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 508                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 509                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 510                         bus_speed = SDIO_SPEED_SDR25;
 511                         timing = MMC_TIMING_UHS_SDR25;
 512                         card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 513                         card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 514         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 515                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 516                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 517                     SD_MODE_UHS_SDR12)) {
 518                         bus_speed = SDIO_SPEED_SDR12;
 519                         timing = MMC_TIMING_UHS_SDR12;
 520                         card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 521                         card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
 522         }
 523
 524         err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
 525         if (err)
 526                 return err;
 527
 528         speed &= ~SDIO_SPEED_BSS_MASK;
 529         speed |= bus_speed;
 530         err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
 531         if (err)
 532                 return err;
 533
 534         if (bus_speed) {
 535                 mmc_set_timing(card->host, timing);
 536                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 537         }
 538
 539         return 0;
 540 }
 541
 542 /*
 543  * UHS-I specific initialization procedure
 544  */
 545 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 546 {
 547         int err;
 548
 549         if (!card->scr.sda_spec3)
 550                 return 0;
 551
 552         /*
 553          * Switch to wider bus (if supported).
 554          */
 555         if (card->host->caps & MMC_CAP_4_BIT_DATA) {
 556                 err = sdio_enable_4bit_bus(card);
 557                 if (err > 0) {
 558                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 559                         err = 0;
 560                 }
 561         }
 562
 563         /* Set the driver strength for the card */
 564         sdio_select_driver_type(card);
 565
 566         /* Set bus speed mode of the card */
 567         err = sdio_set_bus_speed_mode(card);
 568         if (err)
 569                 goto out;
 570
 571         /* Initialize and start re-tuning timer */
 572         if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
 573                 err = card->host->ops->execute_tuning(card->host,
 574                                                       MMC_SEND_TUNING_BLOCK);
 575
 576 out:
 577
 578         return err;
 579 }
 580
 581 /*
 582  * Handle the detection and initialisation of a card.
 583  *
 584  * In the case of a resume, "oldcard" will contain the card
 585  * we're trying to reinitialise.
 586  */
 587 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 588                               struct mmc_card *oldcard, int powered_resume)
 589 {
 590         struct mmc_card *card;
 591         int err;
 592         int retries = 10;
 593
 594         BUG_ON(!host);
 595         WARN_ON(!host->claimed);
 596
 597 try_again:
 598         if (!retries) {
 599                 pr_warning("%s: Skipping voltage switch\n",
 600                                 mmc_hostname(host));
 601                 ocr &= ~R4_18V_PRESENT;
 602                 host->ocr &= ~R4_18V_PRESENT;
 603         }
 604
 605         /*
 606          * Inform the card of the voltage
 607          */
 608         if (!powered_resume) {
 609                 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 610                 if (err)
 611                         goto err;
 612         }
 613
 614         /*
 615          * For SPI, enable CRC as appropriate.
 616          */
 617         if (mmc_host_is_spi(host)) {
 618                 err = mmc_spi_set_crc(host, use_spi_crc);
 619                 if (err)
 620                         goto err;
 621         }
 622
 623         /*
 624          * Allocate card structure.
 625          */
 626         card = mmc_alloc_card(host, NULL);
 627         if (IS_ERR(card)) {
 628                 err = PTR_ERR(card);
 629                 goto err;
 630         }
 631
 632         if ((ocr & R4_MEMORY_PRESENT) &&
 633             mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
 634                 card->type = MMC_TYPE_SD_COMBO;
 635
 636                 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
 637                     memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
 638                         mmc_remove_card(card);
 639                         return -ENOENT;
 640                 }
 641         } else {
 642                 card->type = MMC_TYPE_SDIO;
 643
 644                 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
 645                         mmc_remove_card(card);
 646                         return -ENOENT;
 647                 }
 648         }
 649
 650         /*
 651          * Call the optional HC's init_card function to handle quirks.
 652          */
 653         if (host->ops->init_card)
 654                 host->ops->init_card(host, card);
 655
 656         /*
 657          * If the host and card support UHS-I mode request the card
 658          * to switch to 1.8V signaling level.  No 1.8v signalling if
 659          * UHS mode is not enabled to maintain compatibility and some
 660          * systems that claim 1.8v signalling in fact do not support
 661          * it.
 662          */
 663         if (!powered_resume && (ocr & R4_18V_PRESENT) && mmc_host_uhs(host)) {
 664                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
 665                 if (err == -EAGAIN) {
 666                         sdio_reset(host);
 667                         mmc_go_idle(host);
 668                         mmc_send_if_cond(host, host->ocr_avail);
 669                         mmc_remove_card(card);
 670                         retries--;
 671                         goto try_again;
 672                 } else if (err) {
 673                         ocr &= ~R4_18V_PRESENT;
 674                         host->ocr &= ~R4_18V_PRESENT;
 675                 }
 676                 err = 0;
 677         } else {
 678                 ocr &= ~R4_18V_PRESENT;
 679                 host->ocr &= ~R4_18V_PRESENT;
 680         }
 681
 682         /*
 683          * For native busses:  set card RCA and quit open drain mode.
 684          */
 685         if (!powered_resume && !mmc_host_is_spi(host)) {
 686                 err = mmc_send_relative_addr(host, &card->rca);
 687                 if (err)
 688                         goto remove;
 689
 690                 /*
 691                  * Update oldcard with the new RCA received from the SDIO
 692                  * device -- we're doing this so that it's updated in the
 693                  * "card" struct when oldcard overwrites that later.
 694                  */
 695                 if (oldcard)
 696                         oldcard->rca = card->rca;
 697         }
 698
 699         /*
 700          * Read CSD, before selecting the card
 701          */
 702         if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
 703                 err = mmc_sd_get_csd(host, card);
 704                 if (err)
 705                         return err;
 706
 707                 mmc_decode_cid(card);
 708         }
 709
 710         /*
 711          * Select card, as all following commands rely on that.
 712          */
 713         if (!powered_resume && !mmc_host_is_spi(host)) {
 714                 err = mmc_select_card(card);
 715                 if (err)
 716                         goto remove;
 717         }
 718
 719         if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
 720                 /*
 721                  * This is non-standard SDIO device, meaning it doesn't
 722                  * have any CIA (Common I/O area) registers present.
 723                  * It's host's responsibility to fill cccr and cis
 724                  * structures in init_card().
 725                  */
 726                 mmc_set_clock(host, card->cis.max_dtr);
 727
 728                 if (card->cccr.high_speed) {
 729                         mmc_card_set_highspeed(card);
 730                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
 731                 }
 732
 733                 goto finish;
 734         }
 735
 736 #ifdef CONFIG_MMC_EMBEDDED_SDIO
 737         if (host->embedded_sdio_data.cccr)
 738                 memcpy(&card->cccr, host->embedded_sdio_data.cccr, sizeof(struct sdio_cccr));
 739         else {
 740 #endif
 741                 /*
 742                  * Read the common registers.
 743                  */
 744                 err = sdio_read_cccr(card,  ocr);
 745                 if (err)
 746                         goto remove;
 747 #ifdef CONFIG_MMC_EMBEDDED_SDIO
 748         }
 749 #endif
 750
 751 #ifdef CONFIG_MMC_EMBEDDED_SDIO
 752         if (host->embedded_sdio_data.cis)
 753                 memcpy(&card->cis, host->embedded_sdio_data.cis, sizeof(struct sdio_cis));
 754         else {
 755 #endif
 756                 /*
 757                  * Read the common CIS tuples.
 758                  */
 759                 err = sdio_read_common_cis(card);
 760                 if (err)
 761                         goto remove;
 762 #ifdef CONFIG_MMC_EMBEDDED_SDIO
 763         }
 764 #endif
 765
 766         if (oldcard) {
 767                 int same = (card->cis.vendor == oldcard->cis.vendor &&
 768                             card->cis.device == oldcard->cis.device);
 769                 mmc_remove_card(card);
 770                 if (!same)
 771                         return -ENOENT;
 772
 773                 card = oldcard;
 774         }
 775         mmc_fixup_device(card, NULL);
 776
 777         if (card->type == MMC_TYPE_SD_COMBO) {
 778                 err = mmc_sd_setup_card(host, card, oldcard != NULL);
 779                 /* handle as SDIO-only card if memory init failed */
 780                 if (err) {
 781                         mmc_go_idle(host);
 782                         if (mmc_host_is_spi(host))
 783                                 /* should not fail, as it worked previously */
 784                                 mmc_spi_set_crc(host, use_spi_crc);
 785                         card->type = MMC_TYPE_SDIO;
 786                 } else
 787                         card->dev.type = &sd_type;
 788         }
 789
 790         /*
 791          * If needed, disconnect card detection pull-up resistor.
 792          */
 793         err = sdio_disable_cd(card);
 794         if (err)
 795                 goto remove;
 796
 797         /* Initialization sequence for UHS-I cards */
 798         /* Only if card supports 1.8v and UHS signaling */
 799         if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
 800                 err = mmc_sdio_init_uhs_card(card);
 801                 if (err)
 802                         goto remove;
 803
 804                 /* Card is an ultra-high-speed card */
 805                 mmc_card_set_uhs(card);
 806         } else {
 807                 /*
 808                  * Switch to high-speed (if supported).
 809                  */
 810                 err = sdio_enable_hs(card);
 811                 if (err > 0)
 812                         mmc_sd_go_highspeed(card);
 813                 else if (err)
 814                         goto remove;
 815
 816                 /*
 817                  * Change to the card's maximum speed.
 818                  */
 819                 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
 820
 821                 /*
 822                  * Switch to wider bus (if supported).
 823                  */
 824                 err = sdio_enable_4bit_bus(card);
 825                 if (err > 0)
 826                         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 827                 else if (err)
 828                         goto remove;
 829         }
 830 finish:
 831         if (!oldcard)
 832                 host->card = card;
 833         return 0;
 834
 835 remove:
 836         if (!oldcard)
 837                 mmc_remove_card(card);
 838
 839 err:
 840         return err;
 841 }
 842
 843 /*
 844  * Host is being removed. Free up the current card.
 845  */
 846 static void mmc_sdio_remove(struct mmc_host *host)
 847 {
 848         int i;
 849
 850         BUG_ON(!host);
 851         BUG_ON(!host->card);
 852
 853         for (i = 0;i < host->card->sdio_funcs;i++) {
 854                 if (host->card->sdio_func[i]) {
 855                         sdio_remove_func(host->card->sdio_func[i]);
 856                         host->card->sdio_func[i] = NULL;
 857                 }
 858         }
 859
 860         mmc_remove_card(host->card);
 861         host->card = NULL;
 862 }
 863
 864 /*
 865  * Card detection - card is alive.
 866  */
 867 static int mmc_sdio_alive(struct mmc_host *host)
 868 {
 869         return mmc_select_card(host->card);
 870 }
 871
 872 /*
 873  * Card detection callback from host.
 874  */
 875 static void mmc_sdio_detect(struct mmc_host *host)
 876 {
 877         int err;
 878
 879         BUG_ON(!host);
 880         BUG_ON(!host->card);
 881
 882         /* Make sure card is powered before detecting it */
 883         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
 884                 err = pm_runtime_get_sync(&host->card->dev);
 885                 if (err < 0) {
 886                         pm_runtime_put_noidle(&host->card->dev);
 887                         goto out;
 888                 }
 889         }
 890
 891         mmc_claim_host(host);
 892
 893         /*
 894          * Just check if our card has been removed.
 895          */
 896         err = _mmc_detect_card_removed(host);
 897
 898         mmc_release_host(host);
 899
 900         /*
 901          * Tell PM core it's OK to power off the card now.
 902          *
 903          * The _sync variant is used in order to ensure that the card
 904          * is left powered off in case an error occurred, and the card
 905          * is going to be removed.
 906          *
 907          * Since there is no specific reason to believe a new user
 908          * is about to show up at this point, the _sync variant is
 909          * desirable anyway.
 910          */
 911         if (host->caps & MMC_CAP_POWER_OFF_CARD)
 912                 pm_runtime_put_sync(&host->card->dev);
 913
 914 out:
 915         if (err) {
 916                 mmc_sdio_remove(host);
 917
 918                 mmc_claim_host(host);
 919                 mmc_detach_bus(host);
 920                 mmc_power_off(host);
 921                 mmc_release_host(host);
 922         }
 923 }
 924
 925 /*
 926  * SDIO suspend.  We need to suspend all functions separately.
 927  * Therefore all registered functions must have drivers with suspend
 928  * and resume methods.  Failing that we simply remove the whole card.
 929  */
 930 static int mmc_sdio_suspend(struct mmc_host *host)
 931 {
 932         int i, err = 0;
 933
 934         for (i = 0; i < host->card->sdio_funcs; i++) {
 935                 struct sdio_func *func = host->card->sdio_func[i];
 936                 if (func && sdio_func_present(func) && func->dev.driver) {
 937                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 938                         if (!pmops || !pmops->suspend || !pmops->resume) {
 939                                 /* force removal of entire card in that case */
 940                                 err = -ENOSYS;
 941                         } else
 942                                 err = pmops->suspend(&func->dev);
 943                         if (err)
 944                                 break;
 945                 }
 946         }
 947         while (err && --i >= 0) {
 948                 struct sdio_func *func = host->card->sdio_func[i];
 949                 if (func && sdio_func_present(func) && func->dev.driver) {
 950                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
 951                         pmops->resume(&func->dev);
 952                 }
 953         }
 954
 955         if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 956                 mmc_claim_host(host);
 957                 sdio_disable_wide(host->card);
 958                 mmc_release_host(host);
 959         }
 960
 961         return err;
 962 }
 963
 964 static int mmc_sdio_resume(struct mmc_host *host)
 965 {
 966         int i, err = 0;
 967
 968         BUG_ON(!host);
 969         BUG_ON(!host->card);
 970
 971         /* Basic card reinitialization. */
 972         mmc_claim_host(host);
 973
 974         /* No need to reinitialize powered-resumed nonremovable cards */
 975         if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
 976                 sdio_reset(host);
 977                 mmc_go_idle(host);
 978                 err = mmc_sdio_init_card(host, host->ocr, host->card,
 979                                         mmc_card_keep_power(host));
 980         } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 981                 /* We may have switched to 1-bit mode during suspend */
 982                 err = sdio_enable_4bit_bus(host->card);
 983                 if (err > 0) {
 984                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 985                         err = 0;
 986                 }
 987         }
 988
 989         if (!err && host->sdio_irqs)
 990                 wake_up_process(host->sdio_irq_thread);
 991         mmc_release_host(host);
 992
 993         /*
 994          * If the card looked to be the same as before suspending, then
 995          * we proceed to resume all card functions.  If one of them returns
 996          * an error then we simply return that error to the core and the
 997          * card will be redetected as new.  It is the responsibility of
 998          * the function driver to perform further tests with the extra
 999          * knowledge it has of the card to confirm the card is indeed the
1000          * same as before suspending (same MAC address for network cards,
1001          * etc.) and return an error otherwise.
1002          */
1003         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
1004                 struct sdio_func *func = host->card->sdio_func[i];
1005                 if (func && sdio_func_present(func) && func->dev.driver) {
1006                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
1007                         err = pmops->resume(&func->dev);
1008                 }
1009         }
1010
1011         return err;
1012 }
1013
1014 static int mmc_sdio_power_restore(struct mmc_host *host)
1015 {
1016         int ret;
1017         u32 ocr;
1018
1019         BUG_ON(!host);
1020         BUG_ON(!host->card);
1021
1022         mmc_claim_host(host);
1023
1024         /*
1025          * Reset the card by performing the same steps that are taken by
1026          * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1027          *
1028          * sdio_reset() is technically not needed. Having just powered up the
1029          * hardware, it should already be in reset state. However, some
1030          * platforms (such as SD8686 on OLPC) do not instantly cut power,
1031          * meaning that a reset is required when restoring power soon after
1032          * powering off. It is harmless in other cases.
1033          *
1034          * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1035          * is not necessary for non-removable cards. However, it is required
1036          * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1037          * harmless in other situations.
1038          *
1039          * With these steps taken, mmc_select_voltage() is also required to
1040          * restore the correct voltage setting of the card.
1041          */
1042
1043         sdio_reset(host);
1044         mmc_go_idle(host);
1045         mmc_send_if_cond(host, host->ocr_avail);
1046
1047         ret = mmc_send_io_op_cond(host, 0, &ocr);
1048         if (ret)
1049                 goto out;
1050
1051         if (host->ocr_avail_sdio)
1052                 host->ocr_avail = host->ocr_avail_sdio;
1053
1054         host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1055         if (!host->ocr) {
1056                 ret = -EINVAL;
1057                 goto out;
1058         }
1059
1060         if (mmc_host_uhs(host))
1061                 /* to query card if 1.8V signalling is supported */
1062                 host->ocr |= R4_18V_PRESENT;
1063
1064         ret = mmc_sdio_init_card(host, host->ocr, host->card,
1065                                 mmc_card_keep_power(host));
1066         if (!ret && host->sdio_irqs)
1067                 mmc_signal_sdio_irq(host);
1068
1069 out:
1070         mmc_release_host(host);
1071
1072         return ret;
1073 }
1074
1075 static const struct mmc_bus_ops mmc_sdio_ops = {
1076         .remove = mmc_sdio_remove,
1077         .detect = mmc_sdio_detect,
1078         .suspend = mmc_sdio_suspend,
1079         .resume = mmc_sdio_resume,
1080         .power_restore = mmc_sdio_power_restore,
1081         .alive = mmc_sdio_alive,
1082 };
1083
1084
1085 /*
1086  * Starting point for SDIO card init.
1087  */
1088 int mmc_attach_sdio(struct mmc_host *host)
1089 {
1090         int err, i, funcs;
1091         u32 ocr;
1092         struct mmc_card *card;
1093
1094         BUG_ON(!host);
1095         WARN_ON(!host->claimed);
1096
1097         err = mmc_send_io_op_cond(host, 0, &ocr);
1098         if (err)
1099                 return err;
1100
1101         mmc_attach_bus(host, &mmc_sdio_ops);
1102         if (host->ocr_avail_sdio)
1103                 host->ocr_avail = host->ocr_avail_sdio;
1104
1105         /*
1106          * Sanity check the voltages that the card claims to
1107          * support.
1108          */
1109         if (ocr & 0x7F) {
1110                 pr_warning("%s: card claims to support voltages "
1111                        "below the defined range. These will be ignored.\n",
1112                        mmc_hostname(host));
1113                 ocr &= ~0x7F;
1114         }
1115
1116         host->ocr = mmc_select_voltage(host, ocr);
1117
1118         /*
1119          * Can we support the voltage(s) of the card(s)?
1120          */
1121         if (!host->ocr) {
1122                 err = -EINVAL;
1123                 goto err;
1124         }
1125
1126         /*
1127          * Detect and init the card.
1128          */
1129         if (mmc_host_uhs(host))
1130                 /* to query card if 1.8V signalling is supported */
1131                 host->ocr |= R4_18V_PRESENT;
1132
1133         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1134         if (err) {
1135                 if (err == -EAGAIN) {
1136                         /*
1137                          * Retry initialization with S18R set to 0.
1138                          */
1139                         host->ocr &= ~R4_18V_PRESENT;
1140                         err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1141                 }
1142                 if (err)
1143                         goto err;
1144         }
1145         card = host->card;
1146
1147         /*
1148          * Enable runtime PM only if supported by host+card+board
1149          */
1150         if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1151                 /*
1152                  * Let runtime PM core know our card is active
1153                  */
1154                 err = pm_runtime_set_active(&card->dev);
1155                 if (err)
1156                         goto remove;
1157
1158                 /*
1159                  * Enable runtime PM for this card
1160                  */
1161                 pm_runtime_enable(&card->dev);
1162         }
1163
1164         /*
1165          * The number of functions on the card is encoded inside
1166          * the ocr.
1167          */
1168         funcs = (ocr & 0x70000000) >> 28;
1169         card->sdio_funcs = 0;
1170
1171 #ifdef CONFIG_MMC_EMBEDDED_SDIO
1172         if (host->embedded_sdio_data.funcs)
1173                 card->sdio_funcs = funcs = host->embedded_sdio_data.num_funcs;
1174 #endif
1175
1176         /*
1177          * Initialize (but don't add) all present functions.
1178          */
1179         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1180 #ifdef CONFIG_MMC_EMBEDDED_SDIO
1181                 if (host->embedded_sdio_data.funcs) {
1182                         struct sdio_func *tmp;
1183
1184                         tmp = sdio_alloc_func(host->card);
1185                         if (IS_ERR(tmp))
1186                                 goto remove;
1187                         tmp->num = (i + 1);
1188                         card->sdio_func[i] = tmp;
1189                         tmp->class = host->embedded_sdio_data.funcs[i].f_class;
1190                         tmp->max_blksize = host->embedded_sdio_data.funcs[i].f_maxblksize;
1191                         tmp->vendor = card->cis.vendor;
1192                         tmp->device = card->cis.device;
1193                 } else {
1194 #endif
1195                         err = sdio_init_func(host->card, i + 1);
1196                         if (err)
1197                                 goto remove;
1198 #ifdef CONFIG_MMC_EMBEDDED_SDIO
1199                 }
1200 #endif
1201                 /*
1202                  * Enable Runtime PM for this func (if supported)
1203                  */
1204                 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1205                         pm_runtime_enable(&card->sdio_func[i]->dev);
1206         }
1207
1208         /*
1209          * First add the card to the driver model...
1210          */
1211         mmc_release_host(host);
1212         err = mmc_add_card(host->card);
1213         if (err)
1214                 goto remove_added;
1215
1216         /*
1217          * ...then the SDIO functions.
1218          */
1219         for (i = 0;i < funcs;i++) {
1220                 err = sdio_add_func(host->card->sdio_func[i]);
1221                 if (err)
1222                         goto remove_added;
1223         }
1224
1225         mmc_claim_host(host);
1226         return 0;
1227
1228
1229 remove_added:
1230         /* Remove without lock if the device has been added. */
1231         mmc_sdio_remove(host);
1232         mmc_claim_host(host);
1233 remove:
1234         /* And with lock if it hasn't been added. */
1235         mmc_release_host(host);
1236         if (host->card)
1237                 mmc_sdio_remove(host);
1238         mmc_claim_host(host);
1239 err:
1240         mmc_detach_bus(host);
1241
1242         pr_err("%s: error %d whilst initialising SDIO card\n",
1243                 mmc_hostname(host), err);
1244
1245         return err;
1246 }
1247
1248 int sdio_reset_comm(struct mmc_card *card)
1249 {
1250         struct mmc_host *host = card->host;
1251         u32 ocr;
1252         int err;
1253
1254         printk("%s():\n", __func__);
1255         mmc_claim_host(host);
1256
1257         mmc_go_idle(host);
1258
1259         mmc_set_clock(host, host->f_min);
1260
1261         err = mmc_send_io_op_cond(host, 0, &ocr);
1262         if (err)
1263                 goto err;
1264
1265         host->ocr = mmc_select_voltage(host, ocr);
1266         if (!host->ocr) {
1267                 err = -EINVAL;
1268                 goto err;
1269         }
1270
1271         err = mmc_sdio_init_card(host, host->ocr, card, 0);
1272         if (err)
1273                 goto err;
1274
1275         mmc_release_host(host);
1276         return 0;
1277 err:
1278         printk("%s: Error resetting SDIO communications (%d)\n",
1279                mmc_hostname(host), err);
1280         mmc_release_host(host);
1281         return err;
1282 }
1283 EXPORT_SYMBOL(sdio_reset_comm);